The silver dielectric functions are empirical values by Johnson and Christy [1]} obtained by reflection and transmission spectroscopy on vacuum-evaporated films at room temperature. Film-thickness in the Johnson and Christy study ranged from \(185\,\) Å– \(500\,\) Å. It was found that optical constants in the film-thickness range \(250\,\) Å – \(500\,\) Å did not vary appreciably. As in our previous work, [2]} \(340\,\) Å film thickness is representative of bulk mode dominant (yet still nanoscale) metallic thin films.
